This war, fought in Minnesota, between the US Army and the Santee Sioux involved also some civilians. The casualties amounted to 77 US soldiers, 70 to 1000 Santee Sioux and between 400 to 800 civilians.
The Dakota War of 1862 (also known as the Sioux Uprising, Sioux Outbreak of 1862, the Dakota Conflict, the U.S.–Dakota War of 1862 or Little Crow’s War) was an armed conflict between the United States and several bands of the eastern Sioux or Dakota which began on August 17, 1862, along the Minnesota River in southwest Minnesota. It ended with a mass execution of 38 Dakota men on December 26, 1862, in Mankato, Minnesota.
Throughout the late 1850s, treaty violations by the United States and late or unfair annuity payments by Indian agents caused increasing hunger and hardship among the Dakota. Traders with the Dakota previously had demanded that the government give the annuity payments directly to them (introducing the possibility of unfair dealing between the agents and the traders to the exclusion of the Dakota). In mid-1862 the Dakota demanded the annuities directly from their agent, Thomas J. Galbraith. The traders refused to provide any more supplies on credit under those conditions, and negotiations reached an impasse.
On August 17, 1862, four Dakota killed five American settlers while on a hunting expedition. That night a council of Dakota decided to attack settlements throughout the Minnesota River valley to try to drive whites out of the area. There has never been an official report on the number of settlers killed, but estimates range from 400 to 800. It is said that until the terrorist attacks of Sept. 11, 2001, the civilian wartime toll from the Dakota conflict was the highest in U.S. history (excluding those of the Civil War).
Over the next several months, continued battles between the Dakota against settlers and later, the United States Army, ended with the surrender of most of the Dakota bands. By late December 1862, soldiers had taken captive more than a thousand Dakota, who were interned in jails in Minnesota. After trials and sentencing, 38 Dakota were hanged on December 26, 1862, in the largest one-day execution in American history. In April 1863 the rest of the Dakota were expelled from Minnesota to Nebraska and South Dakota. The United States Congress abolished their reservations.